Gray has a laid-back personality, but will get serious when the time calls for it. He and Natsu have a friendly rivalry, and while they can often be seen fighting one another verbally or physically,the two are actually quite concerned about each other.Gray was quite obstinate and reckless when he was younger, but over time, he has attained a more cautious attitude towards life, and deals with problems carefully. He is very concerned about his comrades and is truly loyal towards his guild, but tends to trash talk every now and then.

Otaku Trivia:

1) Gray's boxers are much longer in the anime, and are usually always black, unlike the manga.

2) Gray stated that ever since he bears the mark of Fairy Tail, he had never lost to the same opponent twice.

3) Gray was originally planned to become the Ice Dragon Slayer, but it was ultimately rejected. Around the Tenrou Island arc, Mashima toyed with the idea again before finally settling on Gray becoming the Ice Devil Slayer just before he started writing the Grand Magic Games.